Maybe you notice a special symbol in the status bar of your Huawei P20, which represents a circle with arrows in the middle and a leaf at the edge. The symbol looks like this so that you can better imagine what we are talking about:
Should you now ask yourself what this symbol stands for, we have the right answer for you here. The symbol stands for active data compression.
This reduces data consumption by preventing background apps from sending or receiving mobile data. If this option is active, you may not receive any e-mails or WhatsApp messages on the Huawei P20.
You can easily deactivate this option as follows: To do this, open:
Settings --> Wireless & Networks --> Mobile Data --> Data Consumption Optimization
Deactivate the function with the slider - done.